Discussion
Assertion (A) : A programmable Read-Only-Memory can be used as a synchronous counter.
Reason (R) : Each memory location of a programmable Read-Only-Memory is programmed and can be read synchronously.
Answer: C
The keyed answer is (A) true and (R) false. A programmable ROM can serve as a synchronous counter, because its output word can be fed back as the next address (through a register clocked together), and the stored contents then define the count sequence, so (A) is accepted. The reason is not accepted by the key: a PROM is programmed once, and the statement that each location can be read synchronously does not explain how it counts. The keyed option is C, and the options calling (A) false or (R) a valid explanation are wrong.
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